Giant magnetoresistance, charge-ordering, and related aspects of manganates and other oxide systems

Authors

  • Prof. C. N. R. Rao,

    Corresponding author
    1. Materials Research Laboratory University of California at Santa Barbara Santa Barbara, CA 93106 (USA)
    • Materials Research Laboratory University of California at Santa Barbara Santa Barbara, CA 93106 (USA)
    Search for more papers by this author
    • C. N. R.Rao received his M.Sc. degree from Banaras (1953), Ph.D. from Purdue University (1958), and D.Sc. from Mysore University (1960). After a research associateship at the University of California, Berkeley, he became a lecturer in physical chemistry at the Indian Institute of Science (IIS) in 1959. He then moved to the Indian Institute of Technology, Kanpur, where he was professor between 1963 and 1976, and returned to IIS in 1976 to found the Solid State & Structural Chemistry Unit and the Materials Research Centre. He was Director of IIS from 1984 to 1994. He is now Albert Einstein Research Professor, and his research interests are in solid-state chemistry, surface science, and spectroscopy.

    • CSIR Centre of Excellence in Chemistry, Indian Institute of Science, Bangalore 560 012, India.

  • Prof. Anthony K. Cheetham

    Corresponding author
    1. Materials Research Laboratory University of California at Santa Barbara Santa Barbara, CA 93106 (USA)
    • Materials Research Laboratory University of California at Santa Barbara Santa Barbara, CA 93106 (USA)
    Search for more papers by this author
    • Anthony K. Cheetham received his B.A. (1968) and D.Phil. (1971) degrees from the University of Oxford. He was a member of the faculty at Oxford between 1974 and 1991 and Fellow of Christ Church College. He moved to the University of California, Santa Barbara, in 1991, where he is professor of chemistry and materials as well as Director of the Materials Research Laboratory. He has been professor of solid-state chemistry at the Royal Institution, London, since 1986. His research interests are in solid-state and structural chemistry and catalysis.


Abstract

Giant magnetoresistance, and spin-, charge-, and orbital-ordering are some of the properties displayed by manganates that make these materials of interest in magnetic recording, sensor, and actuator technology. New and significant results on the giant magnetoresistance found in films as well as polycrystalline and single-crystal samples of rare earth manganates are reviewed along with related aspects. The unique features of these systems and the as-yet unsolved problems are highlighted. Charge-ordering as opposed to spin-ordering is also discussed and suggestions for future directions are given.

Ancillary